Whenever I try to enter my phpMyAdmin, it gives me this error:
The mbstring extension is missing. Please check your PHP configuration.
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The installation process adds the phpMyAdmin Apache configuration file into the /etc/apache2/conf-enabled/ directory, where it is read automatically. The only thing you need to do is explicitly enable the mbstring PHP extension, Because sometimes you forgot to enable the mbstring mode so simply type the below command to enabled the mbstring mode...
sudo phpenmod mbstring
Afterward, restart Apache for your changes to be recognized:
sudo systemctl restart apache2